<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>airplan</title>
    <style>
      body {
        position: relative;
        margin: 0;
        padding: 0;
      }

      canvas {
        position: absolute;
        left: 0;
        top: 0;
        box-shadow: 0 0 10px #333;
      }
    </style>
  </head>

  <body>
    <!-- 注意：canvas大小要和图片宽高要一样大 -->
    <canvas id="bgcanvas" width="480" height="610"> 你的浏览器太low了~ </canvas>
    <canvas id="herocanvs" width="480" height="610">
      你的浏览器太low了~
    </canvas>
    <script src="./21plane.js"></script>
  </body>
</html>
